Land is Life! Do you like mana? I like mana. I love mana, I absolutely abhor not having mana. I like mana more than Tomer likes drawing cards... Well maybe not quite that much..
Titania is extremely powerful in this deck, considering a huge portion of the deck is dedicated to self sacrificing lands and cards that allow us to get rid of and bring back our cuties. A free 5/3 each turn is tantalizing enough, but try five or more. At that point it becomes a bit ludicrous in value, plus she pulls a land back for free each time she enters the battlefield, letting us reuse some of our lands abilities using just her own additional power.
Ambush Commander is one of several ways for us to turn our force of lands into creatures to end the game
Arcane Spyglass is a source of repeatable card draw and a land sac engine all in one. Pretty good for a common, and with our commander its a free 5/3 every turn plus a card
Beast Within most efficient spot removal green seems to have
Blighted Woodland a self saccing land that also grabs two others out of our deck
Cartographer one of many of our diligent workforce providing us with lands from our graveyard
Centaur Rootcaster repeatable land card advantage with attacks, semi reliable but one of a kind
Centaur Vinecrasher A huge threat that lets us sac a land to keep bringing it back
Chain of Acid A strange way of dealing with threats through commander politics, lets you and a buddy blow up some of your own lands for extra copy casting value
City of Traitors One of many of our self saccing lands
Clear the Land Lands for everyone! A group hug of land saccing fun
Coercive Portal a sneakily good board wipe, decided by politics. Either way, it's card advantage!
Command Beacon Pesky people killing poor Titania? This card self sacs and makes sure you keep her at a constant 5 cmc, she gets this land back to sac again later!
Constant Mists This card alone turns this deck into a total pillowfort. Using it and our land advantages, we can stall the game a good solid forever!
Courser of Kruphix extreme card advantage, a nice body, and life gain all for 3 cmc!
Cradle of the Accursed self sacs and with titania makes 7 power and 5 toughness across two creatures for 3 mana!
Creeping Corrosion General artifact hater
Crop Rotation Need a specific land? Get a free 5/3 and go get it!
Crucible of Worlds extreme power, allowing us access to every land in our graveyard every turn!
Cultivate great land puller
Dust Bowl Hate your opponents? Use this to make everyone red faced as you eat away at all of their lands!
Embodiment of Insight Big body, does a lot of work on its own! Lets us get even more value from lands
Eternity Vessel Do you like being hated? Eternity vessel is a permanent stigma of life gain, sticking your life to when you played it. If there's a lack of artifact removal, it's hard to lose.
Far Wanderings meh without threshold, with threshold it's a powerful land finder
Fertile Thicket in a good, but land starved hand, this lets us grab another from our top, essentially an almost guaranteed two land drops
Foundry of the Consuls repeatable self sacrificing land that produces a large threat with titania
Frontier Guide One of a kind repeatable land searcher, bit expensive, but nothing is bad in commander
Gargoyle Castle classic Titania repeatable land saccing combo. Makes a huge threat in elementals and the gargoyle combines
Gauntlet of Power Always a great card in mono colored decks, no matter the distinction
Ghost Quarter cruel combo with recursion, allows for the slow dissolving of every land an opponent controls. Potentially can be used to destroy our own lands to trigger landfall, and produce 10 power and 6 toughness in titania every turn.
Grapple with the Past recursion!
Greenseeker a worse crucible, but still viable!
Halls of Mist Got some creatures beating you up? Self saccing land that stops attacks with a cheapish upkeep!
Harmonize 2 for one!
Harrow Does everything this deck wants to do for 3 mana
Haunted Fengraf repeatable recursion that makes creature with titania!
Havenwood Battleground self saccer
Heart of Yavimaya saccer and an odd pumper
Hickory Woodlot self saccer
Hunting Wilds grabs lands and hits reasonably hard. Costly
Jaddi Offshoot It's like a cute little baby courser than can explosively gain you life!
Journey of Discovery Entwine is nice, mostly here to dump lands
Journeyer's Kite Grabs lands
Kodama's Reach excellent land puller
Life from the Loam arguably one of the most powerful cards in the deck. Lets us make many elementals, grab many lands from our graveyard
Jungle Basin Self saccer
Lotus Vale Makes loads of mana and elementals for basically free. Great
Mikokoro, Center of the Sea Make some friends again by giving them some cards!
Myriad Landscape Sacs, grabs lands, good.
Nissa's Renewal grabs lands, gains life, good
Nissa, Worldwaker Perfect finisher in planeswalker form. Does everything right in this deck
Omnath, Locus of Mana Great finisher, lets us shoot up with mana.
Oracle of Mul Daya Best card/land advantage in the deck
Oxidize Cheap kill for a single artifact, can be recurred later for extra value. Kill a mana crypt to get on someone's Curse of Vengeance salt buddy list!
Petrified Field Self saccing and land conversion, cute
Pulse of Murasa it's like a crappy/better Nissa's Renewal. Gains life and recurs
Rampaging Baloths Can take over the game very easily, grinds out loads of creatures
Rath's Edge Saccer that pings, slow win con
Realms Uncharted grab every relevant land card from our deck for 3 cmc! Doesn't matter what they trash!
Retreat to Kazandu LOTS of lifegain
Scapeshift Can be game ending. Generates a huge pile of titania triggers plus any landfall abilities
Scorched Ruins Generates a lot of mana and makes two elementals
Scute Mob This extremely scute card is left alone, even laughed at. But when we're fogging the game out and attacking with a 5/10/15/20 sized group of scutiepies, they'll regret that.
Seer's Sundial Okay card advantage
Solemn Simulacrum who doesn't play solemn?
Spawning Bed Makes little mana creatures and elementals all in one
Splendid Reclamation another seriously powerful card, even more so than scapeshift is some ways
Squirrel Wrangler a fun as hell way to take over a game
Stoic Builder Recursion workforce
Storm Cauldron huggies! Really annoying to play against on mtgo
Strip Mine Make everyone hate you some more!
Sylvan Advocate decent body and great land buffer (Most people forget his second mode)
Sylvan Safekeeper Land saccer, protects everyone, including titania
Sylvan Scrying grab a specific land! Strip mine anyone?
Tectonic Edge even more salty players and cute elementals
Tempt with Discovery Hugs! and tricks!
Tilling Treefolk best of our land recursion workforce!
Timberland Ruins self saccer
Undergrowth Champion gets huge, blocks for days
Verdant Confluence Buff, recur, land grab, perfect utility
World Breaker Value homewrecker, nukes stuff and is self recurring, plus a juicy sacrifice!
Yavimaya Elder classic, land puller, little blocker, great
Yavimaya Hollow flexible regenerator
Zuran Orb Gains us tons of life while still being a free sac outlet!
+1 if you liked the concept of this deck! I'm hoping to finish buying the rest of this list and I need suggestions on what exactly to swap in or out!